Green - Front ring gear (not attached to a shaft)
Yellow - Both sun gears (mounted on an outer shaft)
Red - Rear carrier (not attached to a shaft)
Blue - Front carrier and rear ring gear. (attached to the output shaft)
Purple - Front and rear planet gears
1st - Hold the red and turn the green. Blue is 40% of input
2nd - Hold the yellow and turn the green. Blue is 66% of input
3rd - Turn the green and yellow. Blue is 100% of input
Overdrive - Hold the yellow and turn the red. Blue is 150% of input
Reverse - Hold the red and turn the yellow. Blue is 50% of input backwards